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Re: [Amps] AL1200 weak receive

To: "Ed Swiderski, KU4BP" <>,
Subject: Re: [Amps] AL1200 weak receive
From: Mark Bitterlich via Amps <>
Reply-to: Mark Bitterlich <>
Date: Fri, 29 Jul 2022 17:45:03 -0400
List-post: <>
Try unplugging the PTT line from the amp and see if the problem goes away. 
Sounds like when you are going to "operate" on the front panel, there is a path 
to ground from the relay coil. Either inside the amp, or the PTT cable going to 
the radio. To confirm you could unsolder one side of the relay coil, etc. 
-------- Original message --------From: "Ed Swiderski, KU4BP" 
<> Date: 7/29/22  12:33 PM  (GMT-05:00) To: Subject: [Amps] AL1200 weak receive I have a confusing 
problem with my AL1200. During operation when the stdby/oper is on, the 
received signal is very weak. Switching back to standby and the signal level is 
fine. Checked the relay and it was operating correctly. Engaging with 12v 
applied to it. With no power to the amp and a rx signal going through, manually 
engaging the relay weakens the signal. Releasing it and it's back to normal. 
Cleaned the contacts using the method described by W8JI on his site. Still no 
go. Stumped on where to look next to track this down. A tests on another radio 
produced the same results.With no power to the amp, I connected my RigExpert 
analyzer to the "RF in" and a dummy load to "RF out". Doing a sweep, the SWR 
reads around 1:1. Engaging the relay by hand shoots the SWR very high. Goes 
back down when released.That's the best symptoms I can give. Any suggestions 
would be an immense help.Thank you,Ed 
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